import { 
  Connection, 
  PublicKey, 
  Keypair, 
  Transaction, 
  SystemProgram, 
  LAMPORTS_PER_SOL
} from '@solana/web3.js';
import { 
  TOKEN_PROGRAM_ID, 
  getAssociatedTokenAddress,
  createAssociatedTokenAccountInstruction
} from '@solana/spl-token';

export class SolanaTrader {
  private connection: Connection;
  private wallet: Keypair;

  constructor() {
    this.connection = new Connection(process.env.SOLANA_RPC_URL || 'https://api.mainnet-beta.solana.com');
    
    if (!process.env.PRIVATE_KEY) {
      throw new Error('PRIVATE_KEY环境变量未设置');
    }
    
    // 从私钥创建钱包
    try {
      // 检查是否为开发模式
      if (process.env.PRIVATE_KEY === 'development_mode' || 
          process.env.PRIVATE_KEY === 'your_private_key_here') {
        console.log('开发模式：生成临时Solana钱包');
        this.wallet = Keypair.generate();
        console.log('Solana临时钱包地址:', this.wallet.publicKey.toString());
      } else {
        // 尝试解析JSON格式的私钥数组
        const privateKeyArray = JSON.parse(process.env.PRIVATE_KEY);
        this.wallet = Keypair.fromSecretKey(new Uint8Array(privateKeyArray));
        console.log('Solana钱包地址:', this.wallet.publicKey.toString());
      }
    } catch (error) {
      console.log('Solana私钥格式错误，生成临时钱包');
      this.wallet = Keypair.generate();
      console.log('Solana临时钱包地址:', this.wallet.publicKey.toString());
    }
  }

  /**
   * 买入代币
   * @param tokenAddress 代币合约地址
   * @param solAmount SOL数量
   */
  async buy(tokenAddress: string, solAmount: number): Promise<string> {
    try {
      console.log(`开始买入 ${tokenAddress}, SOL数量: ${solAmount}`);
      
      // 这里需要集成Jupiter或Raydium等DEX的交换功能
      // 由于涉及复杂的路由和滑点计算，这里提供基础框架
      
      const tokenMint = new PublicKey(tokenAddress);
      const lamports = solAmount * LAMPORTS_PER_SOL;
      
      // 获取关联代币账户地址
      const associatedTokenAccount = await getAssociatedTokenAddress(
        tokenMint,
        this.wallet.publicKey
      );
      
      // 简化版本，直接使用钱包地址进行交换
      // 在实际使用时需要集成Jupiter或Raydium等DEX
      const transaction = new Transaction();

      // 检查关联代币账户是否存在，如果不存在则创建
      const accountInfo = await this.connection.getAccountInfo(associatedTokenAccount);
      if (!accountInfo) {
        const createAccountInstruction = createAssociatedTokenAccountInstruction(
          this.wallet.publicKey, // payer
          associatedTokenAccount, // associatedToken
          this.wallet.publicKey, // owner
          tokenMint // mint
        );
        transaction.add(createAccountInstruction);
      }

      // 这里需要添加实际的交换指令
      // 可以使用Jupiter API或直接与Raydium/Orca等DEX交互
      const swapInstruction = await this.createSwapInstruction(
        tokenMint,
        lamports,
        associatedTokenAccount
      );
      
      transaction.add(swapInstruction);

      // 签名并发送交易
      const signature = await this.connection.sendTransaction(transaction, [this.wallet]);
      
      // 等待确认
      await this.connection.confirmTransaction(signature);
      
      console.log(`Solana买入交易完成: ${signature}`);
      return signature;
      
    } catch (error) {
      console.error('Solana买入失败:', error);
      throw error;
    }
  }

  /**
   * 卖出代币
   * @param tokenAddress 代币合约地址
   * @param tokenAmount 代币数量
   */
  async sell(tokenAddress: string, tokenAmount: number): Promise<string> {
    try {
      console.log(`开始卖出 ${tokenAddress}, 代币数量: ${tokenAmount}`);
      
      const tokenMint = new PublicKey(tokenAddress);
      
      // 简化版本，使用钱包地址

      const transaction = new Transaction();
      
      // 创建卖出交换指令
      const swapInstruction = await this.createSellInstruction(
        tokenMint,
        tokenAmount,
        this.wallet.publicKey
      );
      
      transaction.add(swapInstruction);

      // 签名并发送交易
      const signature = await this.connection.sendTransaction(transaction, [this.wallet]);
      
      // 等待确认
      await this.connection.confirmTransaction(signature);
      
      console.log(`Solana卖出交易完成: ${signature}`);
      return signature;
      
    } catch (error) {
      console.error('Solana卖出失败:', error);
      throw error;
    }
  }

  /**
   * 创建交换指令（买入）
   * 这里需要集成实际的DEX API
   */
  private async createSwapInstruction(
    tokenMint: PublicKey,
    lamports: number,
    destinationAccount: PublicKey
  ): Promise<any> {
    // 这里应该调用Jupiter API或其他DEX的交换服务
    // 示例代码，实际使用时需要替换为真实的交换逻辑
    
    // 可以使用Jupiter API:
    // const jupiterQuote = await this.getJupiterQuote('So11111111111111111111111111111111111111112', tokenMint.toString(), lamports);
    // return await this.createJupiterSwapInstruction(jupiterQuote);
    
    // 临时返回一个空指令作为占位符
    return SystemProgram.transfer({
      fromPubkey: this.wallet.publicKey,
      toPubkey: this.wallet.publicKey,
      lamports: 0
    });
  }

  /**
   * 创建卖出指令
   */
  private async createSellInstruction(
    tokenMint: PublicKey,
    tokenAmount: number,
    walletAddress: PublicKey
  ): Promise<any> {
    // 类似买入，这里需要集成实际的DEX卖出逻辑
    return SystemProgram.transfer({
      fromPubkey: this.wallet.publicKey,
      toPubkey: this.wallet.publicKey,
      lamports: 0
    });
  }

  /**
   * 获取钱包余额
   */
  async getBalance(): Promise<number> {
    const balance = await this.connection.getBalance(this.wallet.publicKey);
    return balance / LAMPORTS_PER_SOL;
  }

  /**
   * 获取代币余额
   */
  async getTokenBalance(tokenAddress: string): Promise<number> {
    try {
      // 简化实现，实际使用时需要查询代币账户
      console.log(`查询代币余额: ${tokenAddress}`);
      return 0; // 临时返回0，需要实际实现
    } catch (error) {
      console.error('获取代币余额失败:', error);
      return 0;
    }
  }

  /**
   * 获取钱包地址
   */
  getWalletAddress(): string {
    return this.wallet.publicKey.toString();
  }
}